body {
    background-color: #fff;
    position: relative;
    top: 0;
    left: 0;
}

.kefu {
    position: fixed;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    z-index: 999;
    bottom: 122px;
    right: 50px;

}

.kefu img {
    width: 70px;
    height: 70px;
    border-radius: 50%;
}